Os w Lekawicy Wastewater Treatment Plant, Soblówka, Poland

Os w Lekawicy is a municipal wastewater treatment plant located in Soblówka, a village in the Silesian Voivodeship of southern Poland. The plant serves a population of 3,246, classifying it as a small agglomeration under Polish and EU regulations. It is situated in the mountainous region of Żywiec County, near the border with Slovakia. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 4,000 m³/day, and the current discharge volume is 462.83 m³/day, indicating ample reserve capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse, likely a tributary of the Soła River, which flows into the Vistula River and eventually to the Baltic Sea. The plant plays a key role in protecting the local watershed, which supports diverse aquatic life and is part of the Carpathian region's sensitive ecosystems.

The plant discharges into a small stream in the Carpathian foothills, which drains into the Soła River, a tributary of the Vistula. The Vistula flows northward through Poland to the Baltic Sea. The watershed supports diverse aquatic life, including salmonid species in the upper reaches, and is ecologically sensitive due to its mountainous terrain and forested catchments. The plant's secondary treatment helps reduce nutrient loading, protecting downstream water quality.